WO2011013294A1 - Moving-magnet loudspeaker and method for manufacturing same - Google Patents
Moving-magnet loudspeaker and method for manufacturing same Download PDFInfo
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- WO2011013294A1 WO2011013294A1 PCT/JP2010/004186 JP2010004186W WO2011013294A1 WO 2011013294 A1 WO2011013294 A1 WO 2011013294A1 JP 2010004186 W JP2010004186 W JP 2010004186W WO 2011013294 A1 WO2011013294 A1 WO 2011013294A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R11/00—Transducers of moving-armature or moving-core type
- H04R11/02—Loudspeakers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
- H04R31/006—Interconnection of transducer parts
Definitions
- the present invention relates to a movable magnet type speaker among electrodynamic type speakers and a manufacturing method thereof.
- a magnetic circuit composed of a magnet and a yoke is fixed to the frame, and a diaphragm on which the voice coil is fixed is attached to the frame so as to vibrate.
- efficiency indicating a ratio of supplied audio current converted into sound energy is known as an index representing the characteristics of a speaker.
- efficiency indicating a ratio of supplied audio current converted into sound energy is known as an index representing the characteristics of a speaker.
- maximum efficiency is when the value of the resulting expression by partially differentiated by the efficiency of the number 2 eta voice coil mass m c is zero, i.e., as shown in Equation 3, the voice coil mass m c but the maximum efficiency is obtained when equal to the sum of the vibration system mass m d other than the voice coil and the diaphragm added mass 2M s.
- voice coil inductance that is proportional to the substantially square of the voice coil winding length is known as an index representing the characteristics of the speaker.
- voice coil inductance of the conventional movable wire ring type speaker an example is shown in the section of electrical impedance characteristics and equivalent circuit of 8.4.2 in Non-Patent Document 1. According to this, when the frequency of the sound current of 10kHz electrical resistance r e of the voice coil is about 8ohms, inductance l e is about 0.6MH.
- the inductance l e that does not hinder the generation of at least about 10 kHz treble needs to be about 0.6 mH or less.
- the crossover frequency f c is approximately 2 kHz.
- Non-Patent Document 2 describes a permanent magnet magnetic circuit used for an electrodynamic speaker.
- the magnetic circuit and the voice coil are exchanged with respect to the movable wire ring speaker, and the magnetic circuit is fixed to the diaphragm and the voice coil is fixed to the frame.
- a movable magnet type speaker is known.
- Patent Documents 1 to 3 describe a movable magnet type speaker.
- the advantage of the movable magnet type speaker is that the voice coil is not attached to the diaphragm unlike the movable wire ring type speaker, so there is no possibility that the tinted wire of the voice coil always vibrates together with the diaphragm and breaks. .
- Non-Patent Document 3 does not describe the movable magnet type speaker, the movable magnet type speaker is not yet in a general state.
- the first problem is a decrease in efficiency.
- the mass of the magnetic circuit occupies most of the mass of the speaker.
- a magnetic circuit of about 400 g or more is often used.
- simply exchanging the mounting position of the magnetic circuit and the voice coil of the conventional movable ring type speaker increases the mass of the vibrating diaphragm and the magnetic circuit. The mismatch becomes large and the efficiency becomes very low. Therefore, only a small sound could be output with respect to the supplied audio current.
- Patent Document 1 the main diaphragm and another diaphragm for producing high sound are provided side by side with a magnetic circuit shared.
- the structure of the speaker is complicated, and there is a possibility that the size of the speaker increases in the vibration direction.
- Patent Document 2 the configuration of the core 10 is complicated, and there is a risk of increasing the size in the vibration direction.
- Patent Document 3 there is a problem that the moving magnet does not enter the fixed coil, or the length of the part that has entered is insufficient, and thus the diaphragm cannot be driven efficiently.
- the present invention has been made in view of the above problems, and an object of the present invention is to provide a movable magnet type speaker whose efficiency is improved by giving a quantitative guide regarding the mass of a magnetic circuit, and a method for manufacturing the same. To do.
- a movable magnet type speaker comprises a magnet and a magnetic material (for example, the ferromagnetic thin plate 4 in the embodiment) according to a magnetic field generated by a voice coil through which an audio current flows.
- a diaphragm having a magnetic circuit is configured to vibrate through the magnetic circuit to generate a sound wave, and the total mass of the magnetic circuit is 0. 0 relative to the total mass of the additional mass and the mass of the diaphragm. 5 to 2.0 times.
- the movable magnet type speaker includes a frame, and the voice coil is divided into a plurality of parts to reduce inductance and prevent a decrease in voice current in a high frequency range, and different positions in the frame.
- the diaphragm is attached to the frame so as to be able to vibrate in the axial direction of the voice coil with a predetermined gap in the axial direction of the voice coil. It is preferable that a circuit is fixed to the diaphragm and faces the voice coil.
- the voice coil is a solenoid coil
- the magnet has a columnar shape and is magnetized in the longitudinal direction thereof, and one end face is fixed to the magnetic body and is magnetically connected to the magnetic body, and the other end face is
- the voice coil is configured to be inserted into a hollow portion of the voice coil to be magnetically coupled to the voice coil.
- the magnet preferably has a dimensional ratio of 1 or more, and the magnetic body extends outward from the outer shape of the voice coil along a plane perpendicular to the longitudinal direction of the magnet. .
- a diaphragm having a magnetic circuit made up of a magnet and a magnetic material in accordance with a magnetic field generated by a voice coil through which an audio current has passed is provided.
- a second magnetic circuit formed so as to have a ratio of 1 or more and extending the magnetic body to the outside of the outer shape of the voice coil along a plane perpendicular to the longitudinal direction of the magnet Manufacturing And a degree.
- the total mass of the magnetic circuit is 0.5 to 2.0 times the total mass of the additional mass and the mass of the diaphragm.
- the voice coil is divided into a plurality of parts to reduce the inductance and prevent the voice current from being lowered in the high sound range.
- the product of the magnetic flux density B and the voice coil winding length l was increased by increasing the voice coil winding length l in order to increase the efficiency. Inevitably occurred, and it was difficult for high-pitched sounds to occur.
- the voice coil is divided into a plurality of parts as described above, the inductance can be reduced while maintaining the product of the magnetic flux density B and the voice coil winding length l. A decrease in current can be prevented.
- the magnet has a columnar shape and is magnetized in the longitudinal direction. One end face is fixed to the magnetic body and magnetically connected to the magnetic body, and the other end face is inserted into the hollow portion of the voice coil to be magnetically coupled. It is preferable that it is comprised so that it may carry out.
- a voice current is supplied to the voice coil 6, the strongest magnetic field is generated in the central portion on the central axis.
- the magnetic pole of the magnet exists in the region where the strongest magnetic field is generated. An open end face can be positioned. Therefore, it is possible to further improve the efficiency of the movable magnet type speaker 10 by causing the strongest magnetic field to act on the magnet to vibrate.
- the dimensional ratio of the magnet is 1 or more, and the magnetic body is spread outside the outer shape of the voice coil.
- the magnetic force lines of the magnet can be sufficiently guided outward by the magnetic material. For example, even at the peripheral end of the voice coil, the induced magnetic force lines are linked to the voice coil. Large electromagnetic force can be generated.
- the method for manufacturing a movable magnet type speaker according to the present invention is a first magnetic circuit manufacturing method in which the total mass of the magnetic circuit is 0.5 to 2.0 times the total mass of the additional mass and the mass of the diaphragm.
- a voice coil manufacturing process in which a voice coil is divided into a plurality of parts to reduce inductance, a magnet is formed so that a dimensional ratio thereof is 1 or more, and a magnetic body is outside an outer shape of the voice coil of the magnet And a second magnetic circuit manufacturing process for extending the distance. Since the movable magnet type speaker is manufactured through the above three manufacturing steps, the movable magnet type speaker is capable of outputting a high sound range by reducing the inductance while maintaining the magnetic flux density of the voice coil, and improving the efficiency. A speaker can be realized.
- FIG. 2 is a cross-sectional view showing a II-II portion in FIG. 1. It is a graph which shows the relationship between the efficiency of the said movable magnet type speaker, and mass ratio (beta).
- the mass ratio ⁇ the mass of the diaphragm including the magnetic circuit mass / additional mass.
- a movable magnet type speaker 10 according to an embodiment of the present invention will be described with reference to the drawings.
- the arrow directions shown in the drawings are defined as front and rear, left and right, and up and down.
- the movable magnet type speaker 10 described below is an example in which the present invention is applied to a so-called full range type speaker that handles the entire sound range, but the present invention is not limited to this and is a so-called tweeter that handles the high sound range, or a low sound range. It can also be applied to woofers that are in charge.
- the movable magnet type speaker 10 includes a ring-shaped fixed support portion 20 and a disc-shaped vibrating portion 30 attached to the front side of the fixed support portion 20.
- the shape of the fixed support part 20 and the vibration part 30 is not limited to the said shape, Other shapes may be sufficient.
- the fixed support portion 20 includes a ring-shaped frame 3, four solenoid type voice coils 6, and a voice coil lead wire 8.
- the frame 3 four voice coil insertion holes 7 penetrating in the front-rear direction are formed.
- the voice coil 6 is formed so that its inner diameter is larger than the outer diameter of a magnet 5 described later.
- One voice coil 6 is embedded in each of the voice coil insertion holes 7 with its central axis facing front and rear, and is bonded and fixed to the voice coil insertion hole 7. With this configuration, the magnet 5 inserted back and forth with respect to the voice coil 6 can vibrate back and forth along the central axis of the voice coil 6.
- the four voice coils 6 embedded in the frame 3 are connected in series by voice coil lead wires 8 embedded in a groove (not shown) provided on the rear surface of the frame 3.
- the end portion of the voice coil lead wire 8 is drawn to the outside as a speaker input 9, and this speaker input 9 is electrically connected to an external voice current output device (not shown). With this configuration, the same voice current is supplied to each of the four voice coils 6 via the voice coil lead wire 8.
- the vibration unit 30 includes a disk-shaped vibration plate 1, an elastic body 2 bonded in the vicinity of the periphery of the vibration plate 1, a ferromagnetic thin plate 4 provided adjacent to the elastic body 2, and a magnet 5. .
- the ferromagnetic thin plate 4 and the magnet 5 are collectively referred to as a magnetic circuit.
- four elastic bodies 2, four ferromagnetic thin plates 4 and four magnets 5 are used in correspondence with the four voice coils 6, respectively.
- the diaphragm 1 can be formed using various materials, but in order to improve the efficiency of the movable magnet type speaker 10, it is preferable that the diaphragm 1 be formed using a material that is as light as possible and that does not deform during vibration. As shown in FIG. 2, the elastic body 2 is formed in a cylindrical shape using an elastically deformable material. For example, a resin tube can be used.
- the elastic body 2 is bonded to the vibration plate 1 and the frame 3 in a state where the elastic body 2 is held back and forth, that is, the vibration plate 1 is attached to the frame 3 via the elastic body 2.
- the thickness corresponding to the diameter of the elastic body 2 is formed so that the open end face of the magnet 5 is located at the center in the front-rear direction on the central axis of the voice coil 6 when the diaphragm 1 is stationary. ing.
- the open end face of the magnet 5 corresponds to the rear end face of the magnet 5 in FIG.
- the elastic body 2 it is also possible to use a so-called deformable edge used for a general speaker.
- the ferromagnetic thin plate 4 is formed in a disc shape, and its diameter is larger than the outer diameter of the voice coil 6. Further, it is desirable that the thickness of the ferromagnetic thin plate 4 is such that the magnetic flux does not leak from the surface opposite to the surface on which the magnet 5 is fixed. In that respect, the thicker the front and rear thickness of the ferromagnetic thin plate 4 is, the better. However, considering that the vibrating portion 30 is lightly formed, it is not practical to make it extremely thick, and an optimum value is selected.
- the ferromagnetic thin plate 4 formed in this way is adhered and fixed to the rear surface of the diaphragm 1 so as to be adjacent to the elastic body 2 in the vicinity of the periphery of the diaphragm 1.
- the magnet 5 is formed in a columnar shape and is magnetized in the axial direction corresponding to the front-rear direction in FIG. 2 so that the dimensional ratio expressed by the front-rear height / diameter is approximately 1.
- the magnet 5 is placed on and fixed to the ferromagnetic thin plate 4 so that the center of the front end face of the magnet 5 coincides with the center of the ferromagnetic thin plate 4.
- the total mass of the four ferromagnetic thin plates 4 and the four magnets 5 formed in this way is set to be substantially the same as the mass of the diaphragm 1. In the present embodiment, for example, the case where the vibration plate 1 is about 5 g, one ferromagnetic thin plate 4 is about 0.5 g, and one magnet 5 is about 0.75 g is illustrated.
- the elastic body 2 can be cited as a member that vibrates together with the vibration plate 1. However, since the entire elastic body 2 does not vibrate, Mass is negligible.
- the magnet 5 is not limited to the configuration with the dimensional ratio of approximately 1, and may have a configuration with the dimensional ratio of approximately 1 or more. From such a configuration, the magnet 5 and the diaphragm 1 fixed to the magnet 5 are positioned so as to vibrate back and forth along the central axis of the voice coil 6.
- the strongest magnetic field is generated in the central portion on the central axis of the voice coil 6, and the magnetic pole of the magnet 5 is centered on this position. Is configured to vibrate the open end face in the back and forth direction. Therefore, the efficiency of the movable magnet type speaker 10 can be improved.
- the Joule heat generated in the voice coil 6 is transmitted to the frame 3 which is in close contact with the outer periphery of the voice coil 6 and is dissipated. It is possible to prevent the coil 6 from being exposed to high temperatures. Furthermore, by forming the frame 3 using a material having a high heat transfer coefficient, heat can be transferred to the frame 3 more efficiently and radiated.
- the tinsel wire may be cut as described in the background art, but such a situation does not occur in the movable magnet type speaker 10 and the failure due to the disconnection is reduced. Stable operation is ensured. Furthermore, in the conventional movable wire ring type speaker, a relatively large magnet is required. However, in the movable magnet type speaker 10, the magnetic circuit is configured in a small size to save resources. The structure is considered.
- the first characteristic configuration of the movable magnet type speaker 10 will be described.
- the first characteristic configuration described below is that the magnetic circuit is composed of the ferromagnetic thin plate 4 and the magnet 5 described above, and the effects of this configuration will also be described.
- the magnet 5 used in the movable magnet type speaker 10 is a columnar magnet having a dimensional ratio of 1 or more as described above, according to the description of the single magnet section of 2.3.1 in Non-Patent Document 2, there are 3 or more.
- the permeance coefficient is obtained.
- a rare earth magnet having a residual magnetic flux density of 1T is used, an operating point magnetic flux density of 0.7T or more can be obtained.
- the surface magnetic flux density is lower than this.
- the maximum amplitude of the diaphragm 1 in the movable magnet type speaker 10 is limited to the height of the front and rear of the magnet 5 due to its structure, but the magnet 5 having the same volume and having a large front and rear height of 1 or more. By using this, a sufficient maximum amplitude can be secured. Furthermore, since the magnetic circuit of the movable magnet type speaker 10 has a configuration in which the ferromagnetic thin plate 4 as a yoke is added to the single magnet 5, it is possible to obtain a higher magnetic flux density.
- the shape of the ferromagnetic thin plate 4 is preferably a shape that generates more magnetic lines of force in the magnet 5 in the radial direction and generates a large electromagnetic force from the viewpoint of efficiency.
- the diameter of the ferromagnetic thin plate 4 is formed larger than the outer diameter of the voice coil 6.
- the magnetic lines of force can be sufficiently induced in the radial direction of the magnet 5, so that, for example, even at the peripheral end portion of the voice coil 6, the induced magnetic lines of force are linked to the voice coil 6 to generate a large electromagnetic force. Can be generated.
- the ferromagnetic thin plate 4 is formed in a thin plate shape, when the ferromagnetic thin plate 4 is fixed to the vibration plate 1, it protrudes in the front-rear direction around the magnet 5. There is no composition to do. Therefore, it is possible to arrange the frame 3 and the voice coil 6 densely in the space around the magnet 5. Further, as described above, the voice coil 6 is embedded in the frame 3, but since the ferromagnetic thin plate 4 is formed in a thin plate shape, it is stronger than the frame 3 when the diaphragm 1 vibrates. There is no possibility of interference with the magnetic thin plate 4. For this reason, the frame 3 can be formed in a flat plate shape, and the entire movable magnet type speaker 10 can be easily thinned in the front-rear direction which is the vibration direction.
- the movable magnet type speaker 10 has a configuration in which the magnetic force lines can be sufficiently guided in the radial direction of the magnet 5 by the ferromagnetic thin plate 4, so that the magnet 5 and the voice coil are compared with the conventional configuration. Even when the gap with 6 is set large, sufficient efficiency can be ensured. As described above, when the gap between the magnet 5 and the voice coil 6 is set large, the maintenance work of the movable magnet type speaker 10 is facilitated.
- the first characteristic configuration of the movable magnet type speaker 10 has been described above.
- a second characteristic configuration of the movable magnet type speaker 10 will be described.
- the second characteristic configuration described below is based on the total mass of the magnetic circuit with respect to the total mass of the additional mass that is the mass of air that vibrates together with the vibration of the diaphragm 1 and the mass of the diaphragm 1.
- the configuration is such that it is 0.5 times or more and 2.0 times or less, and the effect of this configuration will also be described. In this embodiment, it is configured to be 1.0 times.
- the additional mass is the mass of air in a substantially hemispherical area in contact with the diaphragm 1 and is an amount proportional to the cube of the radius of the diaphragm 1.
- the efficiency ⁇ of the movable magnet type speaker 10 is expressed by Formula 4.
- the mass of the magnetic circuit and the mass of the voice coil are in a proportional relationship. Therefore, the ⁇ and proportional constant, it is possible to represent the magnetic circuit mass m m as in equation 5.
- Equation 6 By eliminating the voice coil winding length l from Equation 4 using the relationship of Equation 5, Equation 6 is obtained.
- the maximum efficiency of the movable magnet type speaker 10 is when the value of the resulting expression by partially differentiated by the number 6 efficiency ⁇ magnetic circuit mass m m is zero, i.e. when shown in Formula 7 .
- the maximum efficiency is obtained when equal and vibration system mass excluding a magnetic circuit including the additional mass.
- the mass of the vibration system other than the magnetic circuit is approximately the mass of the diaphragm 1. Therefore, maximum efficiency can be obtained by making the total mass of the magnetic circuit equal to the mass of the diaphragm 1 including the additional mass.
- FIG. 3 shows the relationship between ⁇ / ⁇ max and ⁇ shown in Equation 9.
- ⁇ / ⁇ max > 0.888 is obtained in the range of 0.5 ⁇ ⁇ ⁇ 2. That is, when the total mass of the magnetic circuit is in the range of 0.5 to 2.0 times the mass of the diaphragm 1 including the additional mass, an efficiency exceeding 88.8% of the maximum efficiency can be obtained. it can.
- the second characteristic configuration of the movable magnet type speaker 10 has been described above.
- a third characteristic configuration of the movable magnet type speaker 10 will be described.
- the third characteristic configuration described below is that a plurality of pairs each corresponding to the magnetic circuit and the voice coil 6 are provided. The effects of this configuration will also be described.
- the inductance of the voice coil can be reduced by dividing the voice coil into a plurality of parts and electrically connecting the divided voice coils will be described in detail below.
- the voice coil 6 in the movable magnet type speaker 10 is a solenoid type coil, and the inductance L of the solenoid type coil is
- K the Nagaoka coefficient determined by the ratio of the solenoid diameter to the axial length
- ⁇ the permeability of space
- A the solenoid cross-sectional area
- n the number of turns
- n the axial length
- the solenoid type coil not only the solenoid diameter and the axial length but also the dimensions of all the components including the winding diameter and the winding length are defined as “total dimensions”. That is, by changing the overall dimension, the coil can be enlarged or reduced while maintaining the similar relationship. If the shape of the coil is constant, the physics teaches that the inductance L is proportional to the overall dimensions of the coil, and it can be confirmed from Equation 10. That is, the solenoid cross-sectional area A is proportional to the square of the total size, the axial length l s is proportional to the first power of the overall dimensions, permeability mu, Nagaoka coefficient K and the number of turns n is proportional to the zero power of the overall dimensions To do. Therefore, the inductance L as a whole is proportional to the first power of the overall dimension.
- the inductance L is 0.7939 times.
- the electrical resistance of the entire voice coil is the same as before the division.
- Each voice coil has half the volume while maintaining the similar relationship without changing its shape, so the magnetic circuit necessary to link each voice coil with the same magnetic flux density as before the division However, the volume can be halved by reducing the size by 0.7937 times while maintaining the similar shape without changing the shape.
- the total mass of the magnetic circuit does not change as a whole. That is, for each of the voice coil and the magnetic circuit, the product of the magnetic flux density B and the voice coil winding length l and the electric resistance are obtained by dividing the voice coil and the magnetic circuit without changing the sum in terms of volume and mass and positioning them apart from each other.
- the inductance L can be reduced with the value before the division.
- the electrical resistance is 8 ⁇ and the inductance L is 1 mH at the time of one voice coil before division, it is determined that this configuration is not practical because the inductance L is too large and the high-frequency output is not sufficient. May be.
- the inductance L in the movable magnet type speaker 10, by dividing the voice coil into four pieces and connecting them, the inductance L can be reduced to 0.3969 mH and a value that does not hinder the output of high sound can be achieved. If there is a problem in the output of treble even with this inductance L, it can be dealt with by further increasing the number of divisions.
- each voice coil has half the volume while maintaining the similar relationship without changing its shape, so the magnetic circuit required to link each voice coil with the same magnetic flux density as the original is also shaped.
- the volume can be halved by reducing it to 0.7937 times while maintaining the similar shape without changing. In this way, since two magnetic circuits having a half volume are used, the total mass of the magnetic circuit does not change as a whole.
- the product of the magnetic flux density B and the voice coil winding length l in each divided voice coil is the same value as before the division.
- the substantial contribution of each voice coil to the product of the magnetic flux density B and the voice coil winding length l is half before the division.
- the inductance L can be similarly reduced in either case where the voice coil is divided in series or in parallel.
- the same effect can be obtained when a combination of series and parallel is used.
- the voice coil 6 is divided into four parts while maintaining a similar relationship, thereby reducing the overall inductance of the voice coil 6, and the voice coil 6 at the time of high-frequency output. This prevents a decrease in the audio current supplied to the. In other words, the inductance is reduced by dividing the voice coil 6 so as not to hinder the output in the high sound range. For this reason, it is possible to avoid a decrease in output in the high sound range due to inductance.
- the configuration in which the voice coil 6 is divided into four parts is illustrated. However, depending on design items such as a configuration capable of sufficiently outputting up to which high frequency sound, characteristics of the voice coil 6, and the like. The number of divisions is determined.
- the cylindrical magnet 5 has been described as an example, but the present invention is not limited to this configuration.
- the magnet 5 for example, a rectangular column magnet having a rectangular cross section is used, and instead of the voice coil 6, the internal space is configured using a square coil shape corresponding to the outer shape of the magnet. May be.
- the dimensional ratio at this time is represented by the ratio between the longitudinal dimension and the equivalent diameter obtained by replacing the cross-sectional area of the magnet with a circle of the same area.
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Abstract
Description
ソレノイドの直径と軸方向長さとの比で決まる長岡係数をK、空間の定数である透磁率をμ、ソレノイド断面積をA、巻数をn、軸方向長さをlsとしたとき、数10で表されることが知られている。 The
When the Nagaoka coefficient determined by the ratio of the solenoid diameter to the axial length is K, the permeability of space is μ, the solenoid cross-sectional area is A, the number of turns is n, and the axial length is l s , several 10 It is known that
2 弾性体
3 フレーム
4 強磁性体薄板
5 磁石
6 ボイスコイル
7 ボイスコイル挿入孔
8 ボイスコイル引出し線
9 スピーカ入力
10 可動磁石型スピーカ
20 固定支持部
30 振動部 DESCRIPTION OF
Claims (5)
- 音声電流が流れたボイスコイルが発生する磁界に応じて磁石と磁性体とからなる磁気回路を有する振動板が当該磁気回路を介して振動して音波を発生する可動磁石型スピーカであって、
前記磁気回路の合計質量が、付加質量と前記振動板の質量との合計質量に対して0.5~2.0倍であることを特徴とする可動磁石型スピーカ。 A diaphragm having a magnetic circuit composed of a magnet and a magnetic body according to a magnetic field generated by a voice coil through which an audio current flows is a movable magnet type speaker that vibrates through the magnetic circuit and generates sound waves,
A movable magnet type speaker characterized in that the total mass of the magnetic circuit is 0.5 to 2.0 times the total mass of the additional mass and the mass of the diaphragm. - 前記可動磁石型スピーカはフレームを備え、
前記ボイスコイルは、複数に分割されてインダクタンスが低減され高音域における音声電流の低下を防止するように構成されるとともに、前記フレームにおける異なった位置にその軸方向をそろえて固定され、
前記振動板が、前記フレームに対して前記ボイスコイルの軸方向に所定間隙を有して前記ボイスコイルの軸方向に振動可能に取り付けられ、
複数の前記磁気回路が、前記振動板に固定されて前記ボイスコイルと対向していることを特徴とする請求項1に記載の可動磁石型スピーカ。 The movable magnet type speaker includes a frame,
The voice coil is divided into a plurality of parts to reduce inductance and prevent a decrease in voice current in a high sound range, and is fixed at different positions in the frame with its axial direction aligned,
The diaphragm is attached to the frame so as to vibrate in the axial direction of the voice coil with a predetermined gap in the axial direction of the voice coil;
The movable magnet type speaker according to claim 1, wherein the plurality of magnetic circuits are fixed to the diaphragm and face the voice coil. - 前記ボイスコイルはソレノイドコイルであり、
前記磁石は柱状であってその長手方向に磁化されるとともに、一方端面が前記磁性体に固着されて前記磁性体と磁気的に接続され、他方端面が前記ボイスコイルの中空部に挿入されて前記ボイスコイルと磁気的結合をするように構成されたことを特徴とする請求項1または2に記載の可動磁石型スピーカ。 The voice coil is a solenoid coil;
The magnet has a columnar shape and is magnetized in the longitudinal direction, and one end face is fixed to the magnetic body and is magnetically connected to the magnetic body, and the other end face is inserted into the hollow portion of the voice coil. The movable magnet type speaker according to claim 1, wherein the movable magnet type speaker is configured to be magnetically coupled to a voice coil. - 前記磁石は、その寸法比が1以上に形成され、
前記磁性体は、前記磁石の長手方向に対して垂直な平面に沿って前記ボイスコイルの外形よりも外側に拡がっていることを特徴とする請求項1~3のいずれかに記載の可動磁石型スピーカ。 The magnet has a dimensional ratio of 1 or more,
The movable magnet type according to any one of claims 1 to 3, wherein the magnetic body extends outward from the outer shape of the voice coil along a plane perpendicular to the longitudinal direction of the magnet. Speaker. - 音声電流が流れたボイスコイルが発生する磁界に応じて磁石と磁性体とからなる磁気回路を有する振動板が当該磁気回路を介して振動して音波を発生する可動磁石型スピーカの製造方法であって、
前記磁気回路の合計質量を、付加質量と前記振動板の質量との合計質量に対して0.5~2.0倍とする第1の磁気回路製造工程と、
前記ボイスコイルを、複数に分割してインダクタンスを低減し高音域における音声電流の低下を防止するボイスコイル製造工程と、
前記磁石を、その寸法比が1以上となるように形成し、且つ、前記磁性体を、前記磁石の長手方向に対して垂直な平面に沿って前記ボイスコイルの外形よりも外側に拡がるようにする第2の磁気回路製造工程とを有することを特徴とする可動磁石型スピーカの製造方法。 This is a method of manufacturing a movable magnet type speaker in which a diaphragm having a magnetic circuit composed of a magnet and a magnetic body vibrates through the magnetic circuit in response to a magnetic field generated by a voice coil through which an audio current flows, and generates sound waves. And
A first magnetic circuit manufacturing step in which the total mass of the magnetic circuit is 0.5 to 2.0 times the total mass of the additional mass and the mass of the diaphragm;
Voice coil manufacturing process for dividing the voice coil into a plurality of parts to reduce inductance and prevent a decrease in voice current in a high sound range;
The magnet is formed so that a dimensional ratio thereof is 1 or more, and the magnetic body is spread outside the outer shape of the voice coil along a plane perpendicular to the longitudinal direction of the magnet. And a second magnetic circuit manufacturing process. A method of manufacturing a movable magnet type speaker.
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CN2010800029584A CN102204278A (en) | 2009-07-27 | 2010-06-23 | Moving-magnet loudspeaker and method for manufacturing same |
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JP2009174539A JP4875733B2 (en) | 2009-07-27 | 2009-07-27 | Movable magnet type speaker and manufacturing method thereof |
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Cited By (3)
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CN102957990A (en) * | 2011-08-29 | 2013-03-06 | 何永平 | Electro-acoustic conversion device and tone quality adjusting method thereof |
CN106792402A (en) * | 2017-03-18 | 2017-05-31 | 歌尔股份有限公司 | Moving-magnetic type loudspeaker |
CN107172544A (en) * | 2017-05-02 | 2017-09-15 | 瑞声科技(南京)有限公司 | Vibrator and electronic installation |
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CN105006334B (en) | 2015-06-23 | 2017-08-18 | 歌尔股份有限公司 | Multipath magnetic circuit magnetizes technique |
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JP5941203B1 (en) * | 2015-09-02 | 2016-06-29 | ヤマウチ株式会社 | Exciter |
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CN111479202A (en) * | 2019-01-23 | 2020-07-31 | 捷音特科技股份有限公司 | Moving-magnetic loudspeaker |
CN110381415B (en) * | 2019-08-27 | 2021-06-15 | 联想(北京)有限公司 | Loudspeaker, information processing device and method |
GB202204878D0 (en) * | 2022-04-04 | 2022-05-18 | Pss Belgium Nv | Loudspeaker |
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JP2002531037A (en) * | 1998-11-19 | 2002-09-17 | マイクロテック − コーポレーション | Electro-acoustic converter having moving magnet structure and conversion method therefor |
JP2002171597A (en) * | 2000-11-20 | 2002-06-14 | Koyu Yugenkoshi | Speaker and its manufacturing method |
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CN107172544A (en) * | 2017-05-02 | 2017-09-15 | 瑞声科技(南京)有限公司 | Vibrator and electronic installation |
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KR20120037359A (en) | 2012-04-19 |
JP4875733B2 (en) | 2012-02-15 |
CN102204278A (en) | 2011-09-28 |
JP2011030013A (en) | 2011-02-10 |
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